docs(README): basic description & usage

README.md

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+# Caddy Docker Proxy l4
+
+## Summary
+
+Custom mixed image of
+[caddy-docker-proxy](https://github.com/lucaslorentz/caddy-docker-proxy) and
+[caddy-l4](https://github.com/mholt/caddy-l4)
+
+## Build status
+
+    [![status-badge](https://ci.forge.e5150.fr/api/badges/3/status.svg)](https://ci.forge.e5150.fr/repos/3)
+
+## Description
+
+This image allow using [caddy](https://caddyserver.com/) as a more general
+purpose proxy leveraging caddy capabilities of generating certificates and
+proxying to web services and even more!
+
+## Image links
+
+[OCI Description](https://forge.e5150.fr/e5150/-/packages/container/caddy-docker-proxy-l4/latest)
+
+Pull:
+
+    docker pull forge.e5150.fr/e5150/caddy-docker-proxy-l4:latest